Question: Stamp Overlapping The Plastic Strip

As you can see in the picture, in the second row, the stamps are overlapping the plastic strip (from the first row). In the long run, would the plastic strip have an effect on the back of the stamp?
The stockbook is a lighthouse brand.

The quick answer is yes, it will over time leave an indention that will make the stamp looked warped. It won't happen so quickly you need to pull them out today. Turning them sideways detracts from viewing them. You are stuck with buying more cards or sheets. I use Vario 6s. They are usually large enough to accommodate the larger commemorative and not so large the smaller sizes get lost.

If you do leave stamps overlapping the strip above, or each other, make sure you don't store the book flat, and especially don't stack anything on top of it. (That's good practice, no matter what, but probably critical if you overlap.)

I've never had a problem with the overlap causing bends in the stamp in over 40 years of collecting, and I use both stockbooks and Vario-type pages extensively. But I'm careful to store all my stockbooks/pages upright and not tightly packed. I no longer allow the stamp to overlap the seam on the Vario-style pages because the seam is much more pronounced and "hard"; the risk of introducing a bend is still there even when stored upright if you pack the Vario pages too tightly. With quality stockbooks, I'm not concerned with the stamp overlapping the seam at all.

However, rummaging through dealer offerings over the years, I have seen more than one set of stamps repackaged in collector cards (and collections in stockbooks) which do exhibit bends in the stamp corresponding to the overlap seam. I would guess the damaged was caused by putting the stockbooks/pages flat, as mentioned by 1847bill.

But again, storing stockbooks upright and Vario pages loosely, I've never had that problem.

Also the possibility is there of one of the taller stamps getting caught while turning pages and creasing it. The only reason I mention this is because I just did it.

I never allow the stamp to project above the plastic strip for that reason. I'll use a page with less rows or place the stamp sideways (it's usually a vertical stamp/label pair that has to go sideways).

Regards, Robert

In older style stock books that housed collections I have purchased, the overlapping resulted in what appears to be toning to the exposed portion only. So there appears to be a line where the stamp was more exposed to the elements between the two differently toned areas. These are the old stock books with glassine pockets on manila colored cardboard like material.

Not sure I recall whether I've seen toning due to the covered part being exposed to older style glassine. But, I think I've seen evidence of both types of toning.

But in the cases I saw, the stamps were likely in the books for decades.

Thanks for the feedback,

Would it be better that the stamp will be covered by the plastic strip? or I should mount the stamp then put it in the plastic strip? or it doesnt matter?

If you are using stock books for permanent storage/display of your stamps I would use Vario pages with the correct pages to fit your stamps. Then you have more flexibility with display (plus your pages are independent of each other).

But, if the stamp is completely covered by the plastic, as long as the stock book is of modern construction that's good enough, IMO.

If storage is temporary you are probably okay, but it may depend upon your environment (climate/humidity, dustm etc.).